基于区域极值的图像数字水印算法

Image Digital Watermark Algorithm Based on Region Extremum

为了提高图像在空间域嵌入水印后的透明性和稳健性,提出一种基于图像区域极值的数字水印嵌入和提取方法:首先将图像分为几大块,再将每块分成许多小区域,然后将水印同时嵌入各块每个区域的极值中;在提取水印时按嵌入的逆过程进行。实验结果表明,该算法水印的隐藏效果好、抗裁剪进攻及抗噪声干扰能力较强,并具有较高的运行效率。

For the sake of enhancing the transparence and steadiness of image embedded watermark in spacial domain, a watermark＇s embedding and extracting algorithm based on image region extremum is presented. At first, the image is separated into several blocks, then each block is separated into smaller regions, at last, the watermark is embedded in each smaller region of each block simultaneously. The watermark extracting is an inverse process of watermark embedding. The test results verified that the watermark has good hiding effect, stronger anti -cutting performance and anti -noise interference capacity, as well as higher running efficiency.